From: Avi Kivity <avi@redhat.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Jason Garrett-Glaser <darkshikari@gmail.com>,
Mike Galbraith <efault@gmx.de>,
Andrea Arcangeli <aarcange@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>,
Adam Litke <agl@us.ibm.com>, Izik Eidus <ieidus@redhat.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Nick Piggin <npiggin@suse.de>, Rik van Riel <riel@redhat.com>,
Mel Gorman <mel@csn.ul.ie>, Dave Hansen <dave@linux.vnet.ibm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Mike Travis <travis@sgi.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Christoph Lameter <cl@linux-foundation.org>,
Chris Wright <chrisw@sous-sol.org>,
bpicco@redhat.com,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Arnd Bergmann <arnd@arndb.de>,
"Michael S. Tsirkin" <mst@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Subject: Re: hugepages will matter more in the future
Date: Sat, 17 Apr 2010 22:20:03 +0300 [thread overview]
Message-ID: <4BCA09E3.9010003@redhat.com> (raw)
In-Reply-To: <20100417121803.654fb34e@infradead.org>
On 04/17/2010 10:18 PM, Arjan van de Ven wrote:
> On Sat, 17 Apr 2010 22:05:31 +0300
> Avi Kivity<avi@redhat.com> wrote:
>
>
>> On 04/17/2010 10:05 PM, Arjan van de Ven wrote:
>>
>>> On Sat, 17 Apr 2010 21:18:12 +0300
>>>
>>>
>>>> Correct. We're trying to reduce suckage from 2 cache misses per
>>>> access (3 for virt), to 1 cache miss per access. We're also
>>>> freeing up space in the cache for data.
>>>>
>>>> Saying the application already sucks isn't helping anything.
>>>>
>>>>
>>> but the guy who's writing the application will already optimize for
>>> this case...
>>>
>>>
>> I lost you. What is he optimizing for? 4k pages?
>>
> not totally sucking on cache misses, eg trying to do data locality etc
>
Of course, but it's not always possible. Hence Java and Oracle (and
Linux itself) try to map their data with large pages.
Things like a garbage collector, an LRU, or large object trees that are
traversed by semi-random input are hard/impossible to localize.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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next prev parent reply other threads:[~2010-04-17 19:21 UTC|newest]
Thread overview: 205+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-02 0:41 [PATCH 00 of 41] Transparent Hugepage Support #17 Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 01 of 41] define MADV_HUGEPAGE Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 02 of 41] compound_lock Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 03 of 41] alter compound get_page/put_page Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 04 of 41] update futex compound knowledge Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 05 of 41] fix bad_page to show the real reason the page is bad Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 06 of 41] clear compound mapping Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 07 of 41] add native_set_pmd_at Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 08 of 41] add pmd paravirt ops Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 09 of 41] no paravirt version of pmd ops Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 10 of 41] export maybe_mkwrite Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 11 of 41] comment reminder in destroy_compound_page Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 12 of 41] config_transparent_hugepage Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 13 of 41] special pmd_trans_* functions Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 14 of 41] add pmd mangling generic functions Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 15 of 41] add pmd mangling functions to x86 Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 16 of 41] bail out gup_fast on splitting pmd Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 17 of 41] pte alloc trans splitting Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 18 of 41] add pmd mmu_notifier helpers Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 19 of 41] clear page compound Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 20 of 41] add pmd_huge_pte to mm_struct Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 21 of 41] split_huge_page_mm/vma Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 22 of 41] split_huge_page paging Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 23 of 41] clear_copy_huge_page Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 24 of 41] kvm mmu transparent hugepage support Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 25 of 41] _GFP_NO_KSWAPD Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 26 of 41] don't alloc harder for gfp nomemalloc even if nowait Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 27 of 41] transparent hugepage core Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 28 of 41] verify pmd_trans_huge isn't leaking Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 29 of 41] madvise(MADV_HUGEPAGE) Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 30 of 41] pmd_trans_huge migrate bugcheck Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 31 of 41] memcg compound Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 32 of 41] memcg huge memory Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 33 of 41] transparent hugepage vmstat Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 34 of 41] khugepaged Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 35 of 41] skip transhuge pages in ksm for now Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 36 of 41] remove PG_buddy Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 37 of 41] add x86 32bit support Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 38 of 41] mincore transparent hugepage support Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 39 of 41] add pmd_modify Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 40 of 41] mprotect: pass vma down to page table walkers Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 41 of 41] mprotect: transparent huge page support Andrea Arcangeli
2010-04-05 19:09 ` [PATCH 00 of 41] Transparent Hugepage Support #17 Andrew Morton
2010-04-05 19:36 ` Ingo Molnar
2010-04-05 20:26 ` Pekka Enberg
2010-04-05 20:32 ` Linus Torvalds
2010-04-05 20:46 ` Pekka Enberg
2010-04-05 20:58 ` Linus Torvalds
2010-04-05 21:54 ` Ingo Molnar
2010-04-05 23:21 ` Andrea Arcangeli
2010-04-06 0:26 ` Linus Torvalds
2010-04-06 1:08 ` [RFD] " Linus Torvalds
2010-04-06 1:26 ` Andrea Arcangeli
2010-04-06 1:35 ` Linus Torvalds
2010-04-06 1:13 ` Andrea Arcangeli
2010-04-06 1:38 ` Linus Torvalds
2010-04-06 2:23 ` Linus Torvalds
2010-04-06 5:25 ` Nick Piggin
2010-04-06 9:08 ` Ingo Molnar
2010-04-06 9:13 ` Ingo Molnar
2010-04-10 18:47 ` Andrea Arcangeli
2010-04-10 19:02 ` Ingo Molnar
2010-04-10 19:22 ` Avi Kivity
2010-04-10 19:47 ` Ingo Molnar
2010-04-10 20:00 ` Andrea Arcangeli
2010-04-10 20:10 ` Andrea Arcangeli
2010-04-10 20:21 ` Jason Garrett-Glaser
2010-04-10 20:24 ` Avi Kivity
2010-04-10 20:42 ` Avi Kivity
2010-04-10 20:47 ` Andrea Arcangeli
2010-04-10 21:00 ` Avi Kivity
2010-04-10 21:47 ` Andrea Arcangeli
2010-04-11 1:05 ` Andrea Arcangeli
2010-04-11 11:24 ` Ingo Molnar
2010-04-11 11:33 ` Avi Kivity
2010-04-11 12:11 ` Ingo Molnar
2010-04-25 19:27 ` Andrea Arcangeli
2010-04-26 18:01 ` Andrea Arcangeli
2010-04-30 9:55 ` Ingo Molnar
2010-04-30 15:19 ` Andrea Arcangeli
2010-05-02 12:17 ` Ingo Molnar
2010-04-10 20:49 ` Jason Garrett-Glaser
2010-04-10 20:53 ` Avi Kivity
2010-04-10 20:58 ` Jason Garrett-Glaser
2010-04-11 9:29 ` Avi Kivity
2010-04-11 9:37 ` Jason Garrett-Glaser
2010-04-11 9:40 ` Avi Kivity
2010-04-11 10:22 ` Jason Garrett-Glaser
2010-04-11 11:00 ` Ingo Molnar
2010-04-11 11:19 ` Avi Kivity
2010-04-11 11:30 ` Jason Garrett-Glaser
2010-04-11 11:52 ` hugepages will matter more in the future Ingo Molnar
2010-04-11 12:01 ` Avi Kivity
2010-04-11 12:35 ` Ingo Molnar
2010-04-11 15:22 ` Linus Torvalds
2010-04-11 15:43 ` Avi Kivity
2010-04-11 15:52 ` Linus Torvalds
2010-04-11 16:04 ` Avi Kivity
2010-04-12 7:45 ` Ingo Molnar
2010-04-12 8:14 ` Nick Piggin
2010-04-12 8:22 ` Ingo Molnar
2010-04-12 8:34 ` Nick Piggin
2010-04-12 8:47 ` Avi Kivity
2010-04-12 8:45 ` Andrea Arcangeli
2010-04-11 19:35 ` Andrea Arcangeli
2010-04-12 16:20 ` Rik van Riel
2010-04-12 16:40 ` Linus Torvalds
2010-04-12 16:56 ` Linus Torvalds
2010-04-12 17:06 ` Randy Dunlap
2010-04-12 17:36 ` Andrea Arcangeli
2010-04-12 17:46 ` Rik van Riel
2010-04-11 19:40 ` Andrea Arcangeli
2010-04-12 15:41 ` Linus Torvalds
2010-04-12 11:22 ` Arjan van de Ven
2010-04-12 11:29 ` Avi Kivity
2010-04-17 15:12 ` Arjan van de Ven
2010-04-17 18:18 ` Avi Kivity
2010-04-17 19:05 ` Arjan van de Ven
2010-04-17 19:05 ` Avi Kivity
2010-04-17 19:18 ` Arjan van de Ven
2010-04-17 19:20 ` Avi Kivity [this message]
2010-04-12 13:30 ` Andrea Arcangeli
2010-04-12 13:33 ` Avi Kivity
2010-04-12 13:39 ` Andrea Arcangeli
2010-04-12 13:53 ` Avi Kivity
2010-04-13 11:38 ` Ingo Molnar
2010-04-13 13:17 ` Andrea Arcangeli
2010-04-11 10:46 ` [PATCH 00 of 41] Transparent Hugepage Support #17 Ingo Molnar
2010-04-11 10:49 ` Ingo Molnar
2010-04-11 11:30 ` Avi Kivity
2010-04-11 12:08 ` Ingo Molnar
2010-04-11 12:24 ` Avi Kivity
2010-04-11 12:46 ` Ingo Molnar
2010-04-12 6:09 ` Nick Piggin
2010-04-12 6:18 ` Pekka Enberg
2010-04-12 6:48 ` Nick Piggin
2010-04-12 14:29 ` Christoph Lameter
2010-04-12 16:06 ` Nick Piggin
2010-04-12 6:36 ` Avi Kivity
2010-04-12 6:55 ` Ingo Molnar
2010-04-12 7:15 ` Nick Piggin
2010-04-12 7:45 ` Avi Kivity
2010-04-12 8:28 ` Nick Piggin
2010-04-12 9:01 ` Andrea Arcangeli
2010-04-12 9:03 ` Avi Kivity
2010-04-12 9:26 ` Nick Piggin
2010-04-12 9:39 ` Andrea Arcangeli
2010-04-12 10:02 ` Avi Kivity
2010-04-12 10:08 ` Andrea Arcangeli
2010-04-12 10:10 ` Avi Kivity
2010-04-12 10:23 ` Andrea Arcangeli
2010-04-12 10:37 ` Nick Piggin
2010-04-12 10:59 ` Avi Kivity
2010-04-12 12:23 ` Avi Kivity
2010-04-12 13:25 ` Andrea Arcangeli
2010-04-13 0:38 ` Andrew Morton
2010-04-13 6:18 ` Neil Brown
2010-04-13 13:31 ` Andrea Arcangeli
2010-04-13 13:40 ` Mel Gorman
2010-04-13 13:44 ` Andrea Arcangeli
2010-04-13 13:55 ` Mel Gorman
2010-04-13 14:03 ` Andrea Arcangeli
2010-04-12 7:51 ` Ingo Molnar
2010-04-12 7:18 ` Andrea Arcangeli
2010-04-12 6:49 ` Ingo Molnar
2010-04-12 7:35 ` Andrea Arcangeli
2010-04-12 7:08 ` Andrea Arcangeli
2010-04-12 7:21 ` Nick Piggin
2010-04-12 7:50 ` Avi Kivity
2010-04-12 8:07 ` Ingo Molnar
2010-04-12 8:21 ` Andrea Arcangeli
2010-04-12 10:27 ` Mel Gorman
2010-04-12 8:18 ` Andrea Arcangeli
2010-04-12 8:06 ` Andrea Arcangeli
2010-04-12 10:44 ` Mel Gorman
2010-04-12 11:12 ` Avi Kivity
2010-04-12 13:17 ` Andrea Arcangeli
2010-04-12 14:24 ` Christoph Lameter
2010-04-12 14:49 ` Avi Kivity
2010-04-06 9:55 ` Avi Kivity
2010-04-06 9:57 ` Avi Kivity
2010-04-06 11:55 ` Avi Kivity
2010-04-06 13:10 ` Nick Piggin
2010-04-06 13:22 ` Avi Kivity
2010-04-06 13:45 ` Nick Piggin
2010-04-06 13:57 ` Avi Kivity
2010-04-06 16:50 ` Andrea Arcangeli
2010-04-06 17:31 ` Avi Kivity
2010-04-06 18:00 ` Christoph Lameter
2010-04-06 18:04 ` Avi Kivity
2010-04-06 18:47 ` Avi Kivity
2010-04-06 14:44 ` Rik van Riel
2010-04-06 16:43 ` Andrea Arcangeli
2010-04-06 9:30 ` Mel Gorman
2010-04-06 10:32 ` Theodore Tso
2010-04-06 11:16 ` Mel Gorman
2010-04-06 13:13 ` Theodore Tso
2010-04-06 14:55 ` Mel Gorman
2010-04-06 16:46 ` Andrea Arcangeli
2010-04-05 21:01 ` Chris Mason
2010-04-05 21:18 ` Avi Kivity
2010-04-05 21:33 ` Linus Torvalds
2010-04-05 22:33 ` Chris Mason
2010-04-06 8:30 ` Mel Gorman
2010-04-06 11:35 ` Chris Mason
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